One thing I learned about growing giganteas ... Keep the leaves dry. They can be fussy about getting water in the nooks and crannies bacteria and fungus love them. I lost a largish mature plant by getting a sun burn on the crown. One of my favourite orchids.
Sorry to hear about your dealings with Clown Orchids. Orchid Board has in the past kept good ties with Peter Lin at Big Leaf. They are always a great source in my opinion. Good luck.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"